A tragedy turns the originally carefree Guan Hongyu into a wanted suspect on the run.The twin brother Guan Hongfeng, the captain of the criminal investigation detachment, vowed to find out the truth. However, due to the principle of avoidance of relatives, the police force prohibited Guan Hongfeng from participating in the investigation of the family murder case, and Guan Hongfeng resigned in anger.Zhou Xun, who was transferred to acting detachment leader, was under pressure to solve the case. In order to track down Guan Hongyu's whereabouts, he designed the resigned Guan Hongfeng to continue to participate in the investigation of major serious cases as a “non-staff consultant”, while everyone in the police force was concealed..Suffering from “dark phobia”, “Advisor Guan Hongfeng” who appears in the police force day and night is actually played by two twin brothers in the white night. The two brothers with very different personalities are constantly making mistakes in the police force, and they are burdened with the responsibility of being surrounded by others at any time.Patrolling the dangers discovered by people from all walks of life, they solved various major and important cases along the way. The purpose was just to wait for an opportunity to read the case files of the Miemen case to find out the truth and clear their names.